Rockwell Automation Logix5000 Controllers Controller Information and Status Programming Manual - Manual (Page 31)

Controller logging Chapter 3
Example: Total Entry Count by using a Get System Value (GSV) ladder instruction
The following rung of ladder logic shows how to set the Total Entry Count to a
known value (in this example, 0) by using an SSV instruction.
Example: Set the Total Entry Count to a Known Value ladder instruction
Unsaved Entry Count
The Unsaved Entry Count is the number of log entries that are in controller
memory but have not yet been stored to the CompactFlash card.
This counter value is available via a GSV instruction, and can range from 0…100,
the maximum number of entries that the controller can buffer.
The following rung of ladder logic shows how to retrieve the Unsaved Entry
Count by using a Get System Value (GSV) instruction.
Rockwell Automation Publication 1756-PM015F-EN-P – October 2014 31